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binary integration odd numbers addition routes geometric means area spheres pentagons division sport square grids mean symmetry christmas irreducible numbers matrices trigonometry percentages balancing number lists regular shapes differentiation neighbours the only crossnumber geometric mean lines scales dates coordinates multiplaction squares probabilty dodecagons arrows games median polygons remainders factors ave prime factors algebra probability floors triangle numbers proportion folding tube maps digital products axes digits sum to infinity angles tiling dice rectangles crosswords numbers determinants indices perfect numbers squares circles planes even numbers parabolas square roots combinatorics triangles rugby calculus palindromes wordplay multiplication quadrilaterals logic unit fractions digital clocks products volume bases averages consecutive integers shape elections speed ellipses crossnumbers chess doubling coins taxicab geometry 2d shapes people maths advent decahedra sets surds cards time graphs chalkdust crossnumber tournaments range fractions square numbers books sums chocolate colouring cubics perimeter geometry expansions powers cryptic crossnumbers dominos clocks menace multiples polynomials star numbers gerrymandering cryptic clues albgebra pascal's triangle hexagons consecutive numbers quadratics integers shapes sequences means complex numbers grids money 3d shapes partitions cube numbers functions tangents factorials medians xor prime numbers